A19AAT Type Cooling Thermostats for Portable Applications

Transcription

Installation Instructions
Issue Date April 25, 2014
A19AAT Type Cooling Thermostats
for Portable Applications
Application
IMPORTANT: Use this A19AAT Type Cooling
Thermostat only to control equipment under normal
operating conditions. Where failure or malfunction of
the cooling thermostat could lead to personal injury
or property damage to the controlled equipment or
other property, additional precautions must be
designed into the control system. Incorporate and
maintain other devices, such as supervisory or alarm
systems or safety or limit controls, intended to warn
of or protect against failure or malfunction of the
cooling thermostat.
IMPORTANT : Utiliser ce A19AAT Type Cooling
Thermostat uniquement pour commander des
équipements dans des conditions normales de
fonctionnement. Lorsqu'une défaillance ou un
dysfonctionnement du cooling thermostat risque de
provoquer des blessures ou d'endommager
l'équipement contrôlé ou un autre équipement, la
conception du système de contrôle doit intégrer des
dispositifs de protection supplémentaires. Veiller
dans ce cas à intégrer de façon permanente d'autres
dispositifs, tels que des systèmes de supervision ou
d'alarme, ou des dispositifs de sécurité ou de
limitation, ayant une fonction d'avertissement ou de
protection en cas de défaillance ou de
dysfonctionnement du cooling thermostat.
2-1/8
(54)
3/8
(9)
The A19AAT type thermostats are single-stage cooling
controls with Single-Pole, Single-Throw (SPST)
switches that open on temperature drop.
The A19AAT type thermostats are designed to
override on-board refrigerator thermostats and provide
accurate temperature control outside of the range of
the on-board thermostats.
The A19AAT-2 model thermostat has an adjustable
20 to 80°F (-7 to 27°C) set point range, a fixed
differential, and is enclosed in a rugged steel NEMA 1
enclosure.
Installation
Parts Included
Parts included with an A19AAT type thermostat are:
•
one beaded-chain mounting hanger with sleeves
and snap plugs, and mounting-hanger assembly
instructions
•
one factory-installed set point adjustment knob
•
one pre-wired 6 ft. extension cord with a polarized,
grounded, in-series, male plug and female
plug-end that is mounted to the control with a
strain relief fitting
1-9/16
(39)
1-13/16
(46)
5/8
(15)
9/16
(14)
4-3/8
(112)
3/8
(10)
2-15/16
(75)
3/4
(19)
3/8
(7) 5/16
(8)
6 ft. Capillary
1.8m Tube
3
76
5
127
1/8
(4)
3/8
10
Remote Sensor Bulb
Figure 1: A19AAT-2C Model Thermostat Dimensions, in. (mm)
© 2014 Johnson Controls, Inc.
Part No. 24-7664-2578, Rev. A
1
www.johnsoncontrols.com
Mounting
!
WARNING: Risk of Electric Shock.
Disconnect all electric power sources from the
device before removing the device cover. Contact
with internal components carrying hazardous voltage
can cause electric shock and may result in severe
personal injury or death.
AVERTISSEMENT : Risque de décharge
électrique. Déconnecter toutes les sources
d'alimentation électrique de l'appareil avant de déposer
le capot de l'appareil. Tout contact avec des
composants internes conducteurs de tensions
dangereuses risque d'entraîner une décharge
électrique et de provoquer des blessures graves, voire
mortelles.
Mount the thermostat in an accessible location where
the control body, electrical cord, capillary tube and
sensing element are not subject to damage.
Mount the thermostat to a flat, vertical surface through
the mounting holes in back of the case or hang the
thermostat from a sturdy support using the
beaded-chain assembly included with the thermostat.
Refer to the assembly instruction included with the
beaded-chain hanger assembly.
IMPORTANT: Mounting an A19AAT type
thermostat on a rough or uneven surface may warp
the control case and cause the thermostat to operate
out of the intended temperature range. When
mounting to rough or uneven surfaces, use only the
top two mounting holes at the back of the
thermostat. To avoid warping the thermostat case,
do not over tighten the mounting screws.
2
Protecting the Capillary Tube and Sensing Bulb
Observe the following Caution statements when
installing the thermostat and mounting the remote
sensor bulb.
!
CAUTION: Risk of Environmental and
Property Damage.
Avoid sharp bends in the capillary tubes. Sharp
bends can weaken or kink capillary tubes, which
may result in refrigerant leaks or restrictions of flow.
MISE EN GARDE : Risque de dommages
environnementaux et dégâts matériels. Éviter de
former des coudes serrés avec les tubes capillaires.
Les coudes serrés peuvent affaiblir les tubes
capillaires ou engendrer des pliures, ce qui risque de
provoquer des fuites de réfrigérant ou d'en gêner
l'écoulement.
!
CAUTION: Risk of Environmental and
Property Damage.
Coil and secure excess capillary tubing away from
contact with sharp or abrasive objects or surfaces.
Vibration or sharp or abrasive objects in contact with
capillary tubes can cause damage that may result in
refrigerant leaks or loss of element charge, which
may result in damage to the environment or
property.
MISE EN GARDE : Risque de dommages
environnementaux et dégâts matériels. Enrouler
et fixer l'excédent de tubes capillaires de manière à
éviter tout contact avec des objets coupants ou des
surfaces abrasives. Des vibrations ou des objets
coupants ou abrasifs en contact avec les tubes
capillaires risque d'endommager ceux-ci et
d'occasionner des fuites de réfrigérant ou des pertes
de charge, susceptibles de provoquer des
dommages environnementaux ou des dégâts
matériels.
A19AAT Type Cooling Thermostats for Portable Applications Installation Instructions
!
CAUTION: Risk of Property Damage.
Do not dent or deform the sensing bulb. Dents or
deformations in the sensing bulb can change the
calibration, may cause the control to operate at
temperatures other than the set point, and may
result in other property damage.
MISE EN GARDE : Risque de dégâts matériels.
Ne pas bosseler ou déformer le bulbe thermostatique.
Tout bosselage ou toute déformation du bulbe
thermostatique risque de modifier les paramètres
d'étalonnage, d'induire des températures de
fonctionnement du dispositif de contrôle différentes du
point de consigne et de provoquer d'autres dégâts
matériels.
Wiring
A19AAT Type
Thermostat
Dial
2
COM
2 to COM opens on
temperature drop.
Power
Supply
120
VAC COM
Cooling
Load
Cooling Load Plug
Observe the following safety statements and see the
wiring diagram in Figure 2 when powering the
thermostat and adjusting the thermostat’s set point
stop. Do not change or alter the factory wiring of the
A19AAT type thermostat in any way.
!
Polarized, Grounded, Two-Way
Male Plug and Female Plug-End
Grounded Receptacle
or
Grounded Plug-End
Figure 2: Wiring for the A19AAT Type Thermostat
Setup and Adjustments
mortelles.
IMPORTANT: Plug the A19AAT type thermostat
into a polarized, earth ground receptacle or socket
only.
The A19AAT type thermostats are designed to
override the on-board thermostat on 120 VAC
refrigerators and maintain a temperature set point
above the range of the on-board thermostat.
On refrigerator control applications:
1. Adjust the refrigerator’s on-board thermostat to the
coldest setting.
2. Plug the refrigerator’s plug into the thermostat’s
female plug end and plug the male plug into a
polarized, grounded 120 VAC receptacle.
3. Adjust the A19AAT thermostat set point.
IMPORTANT: Do not use the freezer portion of a
refrigerator when using an A19AAT type thermostat
to override a refrigerator’s on-board thermostat. On
override applications the freezer compartment of the
refrigerator may not adequately freeze products in
the freezer compartment.
3
Adjusting the Thermostat Set Point
Adjust the set point using the external adjustment
knob. The set point adjustment range on the
A19AAT-2C model thermostat is 20 to 80°F (-7 to
27°C).
The thermostat temperature differential is factory set at
3.5F° (2C°) and is not adjustable.
IMPORTANT: Always retighten the set point stop
adjustment screw before putting the thermostat into
operation. Failure to retighten the set point stop
screw may cause the thermostat to lose calibration.
The set point stop temperature is indicated by the set
point indicator.
Adjusting the Set Point Stop
A19AAT type thermostats have an adjustable set point
stop that may be set to limit the low cutout temperature
adjustment. See Figure 3.
!
mortelles.
To adjust and set the set point stop:
1. Disconnect the thermostat plug from the power
supply receptacle and remove the thermostat
cover.
2. Loosen the set point stop adjustment screw and
move it along the set point stop bracket (while
adjusting the temperature range dial) until the
adjustment screw is positioned in the path of the
appropriate set point stop adjustment step
(Figure 3).
Figure 3: Adjusting the Set Point Stop
Checkout
Before applying power, make sure installation and plug
connections are according to job specifications. After
completing the necessary checks and adjustments, an
operational checkout is required.
Adjust the control set point to put the system in
operation and observe at least three complete
operating cycles to be sure that all components are
functioning correctly.
If the system fails to operate, recheck the wiring,
settings, and components.
Repairs and Replacement
Do not make field repairs to A19AAT type thermostats.
Contact the nearest Johnson Controls distributor for a
replacement thermostat.
4
Technical Specifications
Product
Switch Action
Temperature Bulb Style
and Capillary Tube Length
Temperature Range
A19AAT Type Cooling Thermostats for Portable Applications
A19AAT-2 Model Cooling Thermostat
SPST Pennswitch (See Figure 2.)
Style 1 Remote Sensing Bulb with a 6 ft. (1.8 m) Capillary Tube
20 to 80°F; (-7 to 27°C)
Differential
3.5F° (2C°) Non-adjustable
Ambient Temperature
-40 to 140°F; (-40 to 60°C)
Maximum Allowable Bulb
Temperature
Electrical Ratings
140°F (60°C)
Applied Voltage
Motor, Full Load Amperes
Motor, Locked Rotor Amperes
Case and Cover
Dimensions (H x W x D)
Approx. Shipping Weight
120 VAC
15 A
90 A
Non-inductive, SPST Watts
1000 W
Pilot Duty Volt-Amperes
125 VA
NEMA 1 Enclosure: Case, galvanized steel. Cover, galvanized and painted steel
4-3/8 x 2-1/8 x 1-13/16 in. (112 x 54 x 46 mm)
1.6 lb (0.7 kg)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, contact Application Engineering at 1-800-275-5676. Johnson Controls, Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
Building Efficiency
507 E. Michigan Street, Milwaukee, WI 53202
® Johnson Controls and PENN are registered trademarks of Johnson Controls, Inc. in the
United States of America and/or other countries. All other trademarks used herein are the property
of their respective owners. © Copyright 2014 by Johnson Controls, Inc. All rights reserved.
5

A19AAT Type Cooling Thermostats for Portable Applications

Transcription

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